Chapter 7
Fluid Mechanics
Euler equation
Fondamental : Volume forces, mass forces
On the assumption of perfect fluid, neglecting the forces of viscosity.
A fluid element of volume and of mass is subjected to forces of mass or volume representation according to the expression :
Examples :

Gravitational forces :

Pressure forces :
Fondamental : Euler equation
In an inertial frame (R), the Newton's second law applied to a fluid of mass which we follow the particle movement and subjected to the forces can be written :
With :
Hence the Euler equation :
Or :
Attention : Euler equation
Or :